What constitutes the central and peripheral nervous systems? How are the components of central nervous system protected?

Explanation

Central nervous system comprises of brain and spinal cord and the peripheral nervous system is composed of different nerves which are outside the spinal cord.
Central nervous system has a well-developed system for its protection. The brain is enclosed in a hard shell known as the skull. Spinal cord is enclosed in the vertebral column for its protection. Along with these, there is a cerebrospinal fluid which protects the brain from mechanical shocks.